Patent GB-1392394-A (GB)
Title: Tyre building apparatus
IPC: B29D30/00
Filed: 1972-07-03
Abstract: 1392394 Tyre building apparatus INTERCOLE AUTOMATION Inc 3 July 1972 [25 Aug 1971] 31074/72 Heading B7C In a tyre building apparatus including a rotatable radially expansible building drum B, turning up of each end of a tyre carcass C on the drum about a bead wire and stitching the same is effected by pivoting and axially moving a plurality of circumferentially arranged, pivoted, bifurcated members 14. Each member 14 at the left of the drum is pivoted at 18 on a unit 22 slidable along a shaft R by means of compressed fluid actuated rams Z. A collar 40 is slidable axially relative to unit 22 by means of rams X, and a further collar 36 is slidable axially relative to the collar 40 by means of rams W. A bead carrier K is slidable axially of shaft R by means of rams Y (only one being shown) mounted on the collar 40. The shaft R is secured to a support S which is movable towards and away from the drum by means of a ram U. A fixed sleeve F secured to a main frame (not shown) encloses a rotary shaft E and has axially slidable thereon a plurality of pivoted bifurcated members G, a bead carrier J, and rams identical with those described above. The radially inner and outer tines 80, 82 of each members 14 overlap in the circumferential direction with the respective tines of the adjacent members when the latter are in their collapsed positions (Figs. 3 and 9, not shown). Two adjacent members have the configurations of Figs. 10 and 11. In operation, with the apparatus initially in the condition of Fig. 1 excepting that the drum is in its radially collapsed condition, bead wires D are mounted on the carriers J, K, the drum is expanded to its building diameter, and the support S is moved towards the drum. The free end of shaft R may support the end of the power shaft E. Carcass plies are then applied to the drum B and are stitched using means not shown. Prior to or after stitching of the carcass plies, actuation of rams X move collars 40 relative to units 22 thus pivoting the members to an intermediate (Fig. 2) position. Rams Z are now actuated to move the units 22 and thus the members 14 axially to the position of Fig. 2. Appropriate actuation of rams X causes the members 14 to be pivoted radially inwardly to the collapsed position. Actuation of rams Y advances the bead carriers towards the drum and, after retraction of the latter, the rams X are actuated to pivot the members 14 radially outwardly until the intermediate position is attained. Actuation of rams W then causes collars 36 to be moved relative to collars 40 so as to pivot the members radially outwardly at a slower rate, from the intermediate position. Simultaneously the rams Z are actuated to move the members axially inwardly of the drum. When the internal diameter of the tines 82 of the members is approximately that of the completed tyre carcass the fluid to rams W is reversed to cause the radially inner ends of those tines to press against the turned up ends of the carcass plies and effect stitching. Axially inward movement of the members continues until the enlarged portions 116 are positioned axially inwardly of the turned up ends. Fluid to rams W is again reversed and the members are moved radially outwardly of the carcass. Rams Z are then actuated to move units H, K along shaft away from the drum, and the ram U is actuated to retract the support S to the position of Fig. 1. The rams are preferably operated by air or oil, and controlled by solenoid operated valves. The operations may be effected in response to actuation of manual switches, but it is preferred that most, if not all, the operations are effected automatically.